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Include all derivatives for acceleration term in MS wells

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This commit is contained in:
Stein Krogstad
2024-01-09 11:59:07 +01:00
parent 3c1481df04
commit cdb43d917b
6 changed files with 103 additions and 64 deletions
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57
opm/simulators/wells/MultisegmentWellSegments.cpp
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@@ -829,43 +829,36 @@ pressureDropValve(const int seg,
template<class FluidSystem, class Indices, class Scalar>
typename MultisegmentWellSegments<FluidSystem,Indices,Scalar>::EvalWell
MultisegmentWellSegments<FluidSystem,Indices,Scalar>::
accelerationPressureLoss(const int seg) const
accelerationPressureLossContribution(const int seg,
const double area,
const bool extra_reverse_flow_derivatives /*false*/) const
{
const auto& segment_set = well_.wellEcl().getSegments();
const double area = segment_set[seg].crossArea();
const EvalWell mass_rate = mass_rates_[seg];
// Compute the *signed* velocity head for given segment (sign is positive for flow towards surface, i.e., negative rate)
// Optionally return derivatives for reversed flow case
EvalWell mass_rate = mass_rates_[seg];
const int seg_upwind = upwinding_segments_[seg];
EvalWell density = densities_[seg_upwind];
// WARNING
// We disregard the derivatives from the upwind density to make sure derivatives
// wrt. to different segments dont get mixed.
EvalWell density = densities_[seg_upwind];
if (seg != seg_upwind) {
density.clearDerivatives();
}
EvalWell accelerationPressureLoss = mswellhelpers::velocityHead(area, mass_rate, density);
// handling the velocity head of intlet segments
for (const int inlet : inlets_[seg]) {
const int seg_upwind_inlet = upwinding_segments_[inlet];
const double inlet_area = segment_set[inlet].crossArea();
EvalWell inlet_density = densities_[seg_upwind_inlet];
// WARNING
// We disregard the derivatives from the upwind density to make sure derivatives
// wrt. to different segments dont get mixed.
if (inlet != seg_upwind_inlet) {
inlet_density.clearDerivatives();
if (!extra_reverse_flow_derivatives){
constexpr int WQTotal = Indices::numEq + PrimaryVariables::WQTotal;
constexpr int SPres = Indices::numEq + PrimaryVariables::SPres;
density.setDerivative(WQTotal, 0.0);
density.setDerivative(SPres, 0.0);
} else {
if (PrimaryVariables::has_water){
constexpr int WFrac = Indices::numEq + PrimaryVariables::WFrac;
density.setDerivative(WFrac, 0.0);
}
if (PrimaryVariables::has_gas){
constexpr int GFrac = Indices::numEq + PrimaryVariables::GFrac;
density.setDerivative(GFrac, 0.0);
}
mass_rate.clearDerivatives();
}
const EvalWell inlet_mass_rate = mass_rates_[inlet];
accelerationPressureLoss -= mswellhelpers::velocityHead(std::max(inlet_area, area), inlet_mass_rate, inlet_density);
}
// We change the sign of the accelerationPressureLoss for injectors.
// Is this correct? Testing indicates that this is what the reference simulator does
const double sign = mass_rate < 0. ? 1.0 : - 1.0;
accelerationPressureLoss *= sign;
return accelerationPressureLoss;
}
const double sign = mass_rate > 0 ? -1.0 : 1.0;
return sign*mswellhelpers::velocityHead(area, mass_rate, density);
}
template <class FluidSystem, class Indices, class Scalar>
void